天然温泉 こうわの湯てんねんおんせん こうわのゆ
A day-spa in Osaka running entirely on onsen water
Last entry is at midnight, half an hour before closing at 00:30, so buy your bathing ticket in good time.
The bathing price isn't listed on the official site; buy your ticket from the vending machine at the entrance. Prepaid e-tickets and a hand-free set (with towel and amenities) are also sold through the nifty onsen app.
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Shared bathing area for all genders
Welcomes children and families
A restaurant or dining room open to visitors, not only meals for overnight guests
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
200 spaces, free for up to 6.5 hours.
A simple thermal spring drawn from 800 m below Osaka's Taisho ward, emerging at 37.4 °C. It is weakly alkaline (pH 7.9), soft on the skin and gentle in character, sitting in Japan's beauty-water family. The posted indications cover nerve pain, muscle ache, joint pain, poor circulation and recovery from fatigue.
Sampled at wellhead
Jet Bath
Steam Sauna
Lukewarm BathKouwanoyu is a day-use bathhouse in Osaka's Taisho-ku, on an ordinary residential street away from downtown. The onsen water here isn't limited to the tubs: even the cold plunge and the wash-area taps run off the same pumped spring water. Outdoors there are three tubs at different heat levels, including a small tsubo-yu (壺湯) pot bath, and indoors a plain hot-water vibra bath called shirayu (白湯). The tower sauna lets off a burst of steam automatically on the hour, and a separate, gentler steam sauna sits alongside it; both are followed by a cold plunge filtered through bincho-charcoal (備長炭). There's also a jet-massage bath and an attached izakaya-style restaurant. It draws a steady crowd of neighborhood regulars, especially on weekday mornings, and the main bath is shallow enough for kids to join in.
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1 review
317. Kouwanoyu, Osaka A super sento with onsen water, 30 minutes from Osaka Station for 800 yen. The opening hours are listed as 10:00 to 00:30. They stamp the 41st Kansai Super Sento 24/25 stamp rally. There is a diner, massage, massage chairs, and a hair salon. Nice setup with the source water at the entrance. 1. Outdoor area. 1.1. Bath with clear water, temperature 42. 1.2. Bath with clear water, temperature 38-39. 1.3. Two barrels. 2. Indoor area. 2.1. Bath with light green water, temperature 40. 2.2. Nine different jets, temperature 40. 2.3. Sauna. 2.4. Steam sauna. 2.5. Cold bath. 02.01.2025
Last updated October 13, 2026
